A Method for Communication on a Multidrop Bus of a Magnetic Resonance System

1. A method of communication on a multidrop bus of a magnetic resonance system, employing an adaptive protocol script for telegrams on said multidrop bus comprising the steps of: with said adaptive protocol script for telegrams on said multidrop bus, implementing adaptive protocol matching using telegram start characters, addresses and frame type binding; decomposing a telegram frame into a device-based link layer and a service layer; using said link layer for differentiating addresses and frame types and enabling devices which use different communication protocols to be simultaneously present on said bus; and said service layer constituting a load of said link layer and service script that is operation-based and that provides providing, for the exterior interfaces which are independent of the communication protocols which are used by said devices.

2. The method of communication on a multidrop bus of a magnetic resonance system as claimed in claim 1 comprising, with a composer, determining telegram headers on the basis of said start characters and addresses.

3. The method of communication on a multidrop bus of a magnetic resonance system as claimed in claim 1 comprising, with said link layer, for confirming completeness of telegrams.

4. The method of communication on a multidrop bus of a magnetic resonance system as claimed in claim 1 wherein a frame of said link layer comprises a start character field, and using said start character for identifying the start of a telegram; at a time of transmission, with a composer, inserting a correct start character in the telegram head portion; and, when preparation for reception is complete, using a valid start character to indicate start of a telegram.

5. The method of communication on a multidrop bus of a magnetic resonance system as claimed in claim 4 wherein said link layer's frame comprises a unit address field, and using said unit address field to indicate the address of a logical channel.

6. The method of communication on a multidrop bus of a magnetic resonance system as claimed in claim 5 , wherein the frame of said link layer comprises a service layer load field, using a text thereto to indicate a work request of a regulator or a return result, and, at a time of transmission, inserting, with the composer the complete load text into the service layer load field of a telegram.

7. The method of communication on a multidrop bus of a magnetic resonance system as claimed in claim 6 wherein the frame of said link layer comprises a main text end character field, and using said main text end character field to indicate that a service layer load field has ended, and, at a time of reception, using an analyzer to scan to as far as the main text end character, and thereby extract the service layer load.

8. The method of communication on a multidrop bus of a magnetic resonance system as claimed in claim 7 said frame of said link comprises a frame check word field, and using said frame check work field to confirm the correctness of the relevant frame telegram.

9. The method of communication on a multidrop bus of a magnetic resonance system as claimed in claim 8 wherein the frame of said link comprises a telegram end character field, and using said telegram and character field to indicate the end of a complete telegram.

10. The method of communication on a multidrop bus of a magnetic resonance system as claimed in claim 9 comprising dividing said service layer into two types, designated request telegrams and feedback telegrams, dependent on the direction of the telegram in which the service layer is present.

11. The method of communication on a multidrop bus of a magnetic resonance system as claimed in claim 10 wherein said request telegrams and feedback telegrams comprise address fields, and using said address fields to support plural channels.

12. The method of communication on a multidrop bus of a magnetic resonance system as claimed in claim 10 wherein said request telegrams and feedback telegrams comprise service type fields, and using said service type fields to indicate service types.

13. The method of communication on a multidrop bus of a magnetic resonance system as claimed in claim 10 wherein said request telegrams and feedback telegrams comprise transaction word fields, and using said transaction word fields to indicate service codes.

14. The method of communication on a multidrop bus of a magnetic resonance system as claimed in claim 10 wherein said request telegrams comprise data specification fields, and using said data specification field to designate date specifications carried by service layer requests.

15. The method of communication on a multidrop bus of a magnetic resonance system as claimed in claim 10 wherein said feedback telegrams comprise response code fields, and using said response code fields to indicate types of service response results.

16. The method of communication on a multidrop bus of a magnetic resonance system as claimed in claim 10 when said request telegrams and feedback telegrams comprise flexible data fields, and using said flexible data fields to indicate variable data sections.

17. The method of communication on a multidrop bus of a magnetic resonance system as claimed in claim 16 comprising, at the time of telegram composition, producing a telegram by a series of insertion operations, each service layer field corresponds to one insertion operation and composes a service layer load field, and making the service layer fields a composite field and inserting the composite field into said link layer.

18. The method of communication on a multidrop bus of a magnetic resonance system as claimed in claim 17 comprising, at the time of telegram analysis, processing a telegram by a series of extraction operations, each service layer field corresponds to one extraction operation, and extracting the service layer field at the time of service layer load field analysis.

19. The method of communication on a multidrop bus of a magnetic resonance system as claimed in claim 18 comprising, with said adaptive protocol script, further implementing checking-out of telegrams on said link layer.

20. The method of communication on a multidrop bus of a magnetic resonance system as claimed in claim 19 said adaptive protocol script matching in correspondence to checked-out telegrams by operations in order to identify different regulators.

21. The method of communication on a multidrop bus of a magnetic resonance system as claimed in claim 20 comprising when a regulator is identified as the result of checking-out and matching, binding the protocol frame type thereof to an address, and, in a main control unit, storing a list table of regulator frame types, and, when said main control unit connects to and accesses said address said main control unit dynamically binds a telegram based on the frame type thereof.